Quote Originally Posted by mtrycraft
DTS cannot be higher bit rate than CD as it is perceptually coded, information is discarded that is deemed inaudible due to masking. Same with DD or any perceptual coding. The bit rate is not everything but the algorythm used is. That is what calculates and discards inaudible signals.
DTS/DD has 5.1 channels too, so that may explain what you may be thinking.

I am not aware of any reliable DBT comparisons on the three.
Impossible to do a DBT like you specify given that there are no soundtracks I'm aware of that have two-channel 16/44.1 PCM, DD, and DTS tracks that were encoded simultaneously.